import sqlite3
from contextlib import closing

from flaskdemo import Flask, g, render_template, session, abort, request, flash, redirect, url_for
from flask_sqlalchemy import SQLAlchemy

SQLALCHEMY_DATABASE_URI='sqlite:///flask.db'
DATABASE = 'flask.db'
DEBUG = True
SECRET_KEY = 'development key'
USERNAME = 'admin'
PASSWORD = 'admin'




app=Flask(__name__)
db=SQLAlchemy(app)


app.config.from_object(__name__)
app.config.from_envvar('FLASKR_SETTINGS', silent=True)




def  connect_db():
    return sqlite3.connect(app.config['DATABASE'])

def init_db():
    with closing(connect_db()) as db :
        with app.open_resource('schema.sql','rb') as f :
            db.cursor().executescript(f.read().decode('utf-8'))
        db.commit()


@app.before_request
def brfor_request():
    print('brfor.....')
    g.db=connect_db()

@app.teardown_request
def teardown_request(exception):
    print('teardown.....')
    g.db.close()


@app.route('/')
def show_entries():
    cur = g.db.execute('select title, text from entries order by id desc')
    entries = [dict(title=row[0], text=row[1]) for row in cur.fetchall()]
    return  render_template('show_entries.html',entries=entries)

@app.route('/add', methods=['POST'])
def add_entry():
    if not session.get('logged_in'):
        abort(401)
    g.db.execute('insert into entries (title, text) values (?, ?)',
                 [request.form['title'], request.form['text']])
    g.db.commit()
    flash('New entry was successfully posted')
    return redirect(url_for('show_entries'))


@app.route('/login', methods=['GET', 'POST'])
def login():
    error = None
    if request.method == 'POST':
        if request.form['username'] != app.config['USERNAME']:
            error = 'Invalid username'
        elif request.form['password'] != app.config['PASSWORD']:
            error = 'Invalid password'
        else:
            session['logged_in'] = True
            flash('You were logged in')
            return redirect(url_for('show_entries'))
    return render_template('login.html', error=error)

@app.route('/logout')
def logout():
    session.pop('logged_in', None)
    flash('You were logged out')
    return redirect(url_for('show_entries'))

if __name__ == '__main__':
    app.run()